Some plays go together like fish and chips; other pairings are less obvious, but the effect is explosive. Neither is quite the case with this intelligent, finely written and acted but insufficiently volatile double bill by Scottish playwrights David Greig and David Harrower. Both plays have been seen individually: Greig's The Letter of Last Resort was part of The Bomb season at London's Tricycle, and Harrower's Good With People was in the Paines Plough/Oran Mor season of 2010.

Both certainly offer a reminder that although Trident looms less darkly over the public consciousness in these post-cold war days, it still lurks in the Arctic depths, and our defence policies always have human consequences. The point is brilliantly made at the start of Greig's The Letter of Last Resort. The new prime minister (played by Belinda Lang) is writing a letter to the family of a British soldier killed on active duty, when she is disturbed by a Whitehall official (Simon Chandler) urging her to write a different letter: a sealed note to the captain of a Trident submarine, ordering him to retaliate (or not) in the event that the UK is wiped out in a nuclear attack. It's a teasing playlet that acknowledges its debt to Yes, Prime Minister.

Less cute and more emotionally dense is Harrower's Good With People. A young Red Cross worker (Richard Rankin) turns up at a hotel in Helensburgh, the town in Scotland that hosts a nuclear naval base, to the consternation of the receptionist (Blythe Duff): she recognises him as the bully who terrorised her son at school. Wariness begins to shift in a strange dance of repulsion and attraction, over which the shadow of armageddon looms.